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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168cf7b7eb126a7edbde72de1afbc28530632b06e73f870fa060e2ab9a15008e' 
  AND token = 'uFChsQi+xtiisBCD0FnAUUBjt+IExZrrevURW/25AKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}